Journal of Radiation Research and Radiation Proces ›› 2018, Vol. 36 ›› Issue (4): 40601-040601.

### Safety evaluation of radio frequency electromagnetic exposure from wireless communication system of subway

ZHOU Wenying, LU Mai

1. Key Laboratory of Opt-Electronic Technology and Intelligent Control Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China
• Received:2018-04-09 Revised:2018-05-04 Online:2018-08-20 Published:2018-08-18
• Supported by:

Supported by National Natural Science Foundation of China (61701208, 51567015), and Lanzhou Jiaotong University Fund for Distinguished Young Scholars (2015036)

Abstract:

To study the radio frequency electromagnetic exposure security of a driver from the subway wireless communication system, the subway cab's RF electromagnetic environment model was established, which was radiated by the antennas of the wireless communication system using a three-dimensional high frequency structure simulator (HFSS). The simulated results of electric field strength distribution in the driver's cab were between 0.005 and 0.118 V/m. The power level of the wireless communication system antenna's signal was measured to be between -54.91 and -30.22 dBm using the electric field strength analyzer, and the electric field intensity in the subway driver's cab was estimated to be in the range of 0.006~0.109 V/m, which is consistent with the simulation results. Thus, the computational reliability of the HFSS electromagnetic simulation software was verified. The absorbed dose in the electromagnetic environment was simulated separately for the standing and sitting posture of the driver's human model on the above basis. The simulation results showed that the peak values of the average specific absorption rate for sitting posture and standing posture were 3.838 3×10-7 W/kg and 3.118 7×10-7W/kg respectively; peak values of electric field intensity for sitting and standing posture were calculated to be 0.12 V/m and 0.11V/m respectively; the peak values of magnetic field strength for sitting posture and standing posture were respectively 7.586 8×10-4A/m and 7.276 7×10-4 A/m. The results obtained for the various peak values were all within the electromagnetic occupational exposure restriction limit, created by the International Commission on Non-Ionizing Radiation Protection(ICNIRP). Thus, this investigation demonstrated that the RF electromagnetic radiation environment in the subway cab was indeed safe for the driver.

CLC Number:

• X837